Polysiloxane prepolymers for biomedical devices

Details Polysiloxane prepolymers for biomedical devices Polysiloxane prepolymers for biomedical devices

2005-12-02

2008-09-09

Zimmer, Marc S (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C526S258000, C526S264000, C526S303100, C526S310000, C526S321000, C526S328000, C526S279000, C528S025000, C528S028000, C528S044000, C528S085000, C523S107000

Reexamination Certificate

active

07423074

ABSTRACT:
A polysiloxane copolymer that is useful for forming biomedical devices comprises blocks (I) and (II) and is terminated at each end with an ethylenically unsaturated radical:in-line-formulae description="In-line Formulae" end="lead"?(*Dii*Diol*Dii*PS)x  (I)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(*Dii*PS)y  (II)in-line-formulae description="In-line Formulae" end="tail"?wherein:each Dii is independently a diradical residue of a diisocyanate;each Diol is independently a diradical residue of a diol having 1 to 10 carbon atoms;each PS is independently a diradical residue of a polysiloxane-containing diol or diamine;each * is independently —NH—CO—NH—, —NH—COO— or —OCO—NH—:x represents the number of blocks (I) and is at least 2, andy represents the number of blocks (II) and is at least 1.

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